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Suppose a car travels 108 km at a speed of 30.0 m/s, and uses 2.0 gal of gasoline.
Only 30% of the gasoline goes into useful work by the force that keeps the car
moving at constant speed despite friction. (The energy content of gasoline is
about 140 Mi/gal.) (a) What is the magnitude of the force exerted to keep the car
moving at constant speed?

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